Thanks brother... Yes, I also did a little research and found that one can't possibly check a 2-Stroke engine's compression!
Anyhow, The mechanic tinkered with this screw inside the red circle, and I've no idea what purpose does it serve...!!!
I'll open the side cover later today (Inshallah) and see what's the current pin position of the carb... I shall keep you posted brother...
Again, thanks a lot brother Hassan, the bike I've is an endangered specie like a Panda. And not only that, but it has a lot of sentimental value to me since it belonged to my deceased father who has passed away few month ago (May his soul rest in peace)... So, you can understand my desperateness about fixing her up and getting her back in good running condition...
Many thanks, Jazak Allah...